Improvement in grain-separators



I. TUBMAN. Grain-Separator.

No. 205,017. v S PatentedJun, e18. 1878.

WITNESSES: (5] INVBNTOR:

ATTORNEYS.

N.FE!ERS. FHQTO-UYHOGRAFNER, WASHINGTON. 01:.

BY I

UNITED STATES PATENT OFFICE.

ISAAC TUBMAN, OF SMITHLAND, IOWA.

IMPROVEMENT IN GRA lN-SEPARATORS.

Specification forming part of Letters Patent No. 205,017, dated June 18,1878 application filed November 13,1877.

To all whom it may concern:

Be it known that I, ISAAC TUBMAN, ot' Smithland, in the county ofWoodbury and State of Iowa, have invented a new and ImprovedGrain-Separator, of which the following is a specification:

In the accompanying drawing, Figure 1 represents a vertical longitudinalsection of my improved grain-separator; and Fig. 2, a top View of thesame, with parts removed to show portions below.

Similar letters of reference indicate corresponding parts.

The object of this invention is to clean oats and other grain of thevarious impurities, such as chaft', dust, dirt, &c., for using it as abetter feed for horses in training, or for seeding or other purposes;and the invention consists of a hopper discharging on a" revolvingcylinder, that throws the oats or grain on a roughened and perforatedconcave plate, from which the grain is conducted on a coarsereciprocating screen, and from the same on a finer inclined screen, andthence into a suitable receptacle, being exposed to a fan'blast duringthe passage through the screens. One side of the hopperis hinged, to bethrown over and admit, by means of a hopper-shaped conductor, the directpassageof the grain to the screens, to be treated in the same manner asin a common fanning-mill. V 1

In the drawing, A represents the hopper, that conducts the grain onto arevolving cylinder, B, with radial stirrer-pins a, by which the grain isthrown against a roughened and perforated concave, O, that extends fromthe hopper around the cylinder to the bottom part of the same. I

The impurities are separated to some extent from the grain by its beingthrown with some force against the perforated concave, the grain beingthen dropped on a coarse reciprocating screen, D, and through the sameon a finer but inclined screen, D. As the grain falls through thereciprocating screens it is exposed to the action of a fan-blast,created by a revolving fan, F, at the end of the separator. The lighterimpurities are thereby separated from the grain and carried ofi throughalarge opening, I), at the opposite ends of the screens, which openingis closed by a hinged door when the machine is not worked. The grainpasses finally from the inclined screen into a sliding box orreceptacle, E, below the fancasing, and is removed from time to time.

Motion is imparted to the cylinder by a hand-crank and gearing, to thefan by beltand-pulley connection, and to the reciprocating screens inany approved manner, as customary in grain-separators.

One side of the hopper A nearest to the fan is hinged, so that it may beraised and swung over, forming, in connection with an inclinedpartition, d, and a curved plate, d, inclosing the cylinder, ahopper-shaped conductor, by which the grain may be dropped directly onthe screens, to be cleared of most of the impurities by the action ofthe screens in connection with'the fan-blast, in the same manner as incommon fanning-mills.

Having thus described my invention, I claim as new and desire to secureby Letters Patent- The combination, with the separator-screens D D andthe scouring-cylinder B, of the hopper A, having the swinging side andpartition, substantially as shown and described, for the purposespecified.

ISAAC TUBMAN.

Witnesses:

PETER GAMBo, J. D. RICE.

